Possible Clues:

• Unwilling to go into print
• Unlikely to pose (... letters 6-8)
• Reluctant to be photographed
• Not keen to be pictured
• Averse to being photographed
• Unhappy with one's image, perhaps
• Avoiding 22 that's light of colour
• Advanced with gunners, nervous and afraid of being shot
• Arrived with king, pale and afraid of being shot
• "Not in the picture"